The correct answer is B) leaking door gaskets. Explanation: If the refrigerated space temperature is slightly above normal without reaching the desired minimum temperature, and the suction and discharge pressures are normal, this suggests that the issue is not related to the refrigeration system itself. Instead, the most likely cause is a problem with air infiltration, which can occur due to leaking door gaskets. Leaky door gaskets allow warm outside air to enter the refrigerated space, preventing the system from reaching the desired temperature, even though the refrigeration components are functioning normally. The other options are less likely in this scenario. Air in the system (A) would likely cause abnormal pressures, a shortage of refrigerant (C) would result in low suction pressure, and high cooling water temperature (D) would affect the discharge pressure, none of which are indicated in the problem description.